CN104594368A - Bamboo raft pile oversized cofferdam and construction method for sea reclamation by adopting same - Google Patents
Bamboo raft pile oversized cofferdam and construction method for sea reclamation by adopting same Download PDFInfo
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- CN104594368A CN104594368A CN201510041742.3A CN201510041742A CN104594368A CN 104594368 A CN104594368 A CN 104594368A CN 201510041742 A CN201510041742 A CN 201510041742A CN 104594368 A CN104594368 A CN 104594368A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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Abstract
The invention discloses a bamboo raft pile oversized cofferdam. The bamboo raft pile oversized cofferdam comprises at least three layers of bamboo fence retaining walls of which the heights are gradually reduced from inside to outside; each bamboo fence retaining wall comprises a moso bamboo frame erected by moso bamboo poles; a blow-filling region is formed in the inner layer of the bamboo fence retaining walls in a surrounding way; a first suppression region is formed between the second layer of the bamboo fence retaining walls and the inner layer of the bamboo fence retaining walls; a second suppression region is formed between the second layer of the bamboo fence retaining walls and the third layer of the bamboo fence retaining walls; each of the first suppression region and the second suppression region is filled with a sludge suppression layer; the height of the top surface of sludge of the blow-filling region is greater than that of the top surface of sludge of the first suppression region; the height of the top surface of the sludge of the first suppression region is greater than that of the top surface of sludge of the second suppression region. The bamboo raft pile oversized cofferdam has the following advantages that the construction is simple and convenient, and the construction duration is short; the construction cost is low; the environment-friendly degree of construction is high, and the environment cost investment is favorably reduced. The invention also provides a construction method for sea reclamation by adopting the bamboo raft pile oversized cofferdam.
Description
Technical field
The present invention relates to a kind of bamboo raft dowel super large cofferdam, particularly relate to the cofferdam for building of reclaiming fields from the sea.The invention still further relates to the construction method adopting above-mentioned bamboo raft dowel super large cofferdam to reclaim fields from the sea.
Background technology
Along with economic, social fast development, coastal area building size expands rapidly, and soil becomes increasingly conspicuous as a kind of limited precious resources and construction land imbalance between supply and demand, and the important outlet solving this contradiction is to extra large strategic point." marine reclamation land " is the vital measure that many countries expand land used always on a large scale.Coffering has very important meaning for total body construction of reclamation.Traditional cofferdam generally adopts sand pocket cofferdam, but due to sand resource more and more rare, cofferdam construction technology needs to open up a kind of new thinking.
Summary of the invention
In view of the deficiency that background technology exists, technical problem to be solved by this invention is to provide a kind of bamboo raft dowel super large cofferdam, and the cost adopting this bamboo raft dowel super large cofferdam can make to reclaim fields from the sea is lower, construction is easier and speed of application is faster.The invention still further relates to the construction method adopting bamboo raft dowel super large cofferdam to reclaim fields from the sea.
The present invention takes following technical scheme: bamboo raft dowel super large cofferdam, comprise at least three layers of bamboo fragrant plant enclosing wall, each bamboo fragrant plant enclosing wall reduces from inside to outside highly gradually, described bamboo fragrant plant enclosing wall comprises the mao bamboon framework that mao bamboon rod member is built, mao bamboon framework comprises the mao bamboon stake of vertical distribution, the mao bamboon strut of oblique setting and the mao bamboon cross bar of horizontally set, described mao bamboon stake, the mutual colligation in position of mao bamboon strut and mao bamboon cross-car is fixed, described mao bamboon stake sets to be goed deep in the soil body, the inner side of described bamboo fragrant plant enclosing wall has set mao bamboon earth anchor, mao bamboon earth anchor is by rope stretch mao bamboon framework, many mao bamboon cross bars of differing heights inwardly shorten from bottom to top gradually, most top layer mao bamboon cross bar is laid bamboo basketry sheet and form manway, the medial surface of described mao bamboon framework is perpendicular to distribution on ground, mao bamboon framework medial surface colligation bamboo basketry sheet, the medial surface of bamboo basketry sheet is provided with woven cloth, the height of the mao bamboon framework of described bamboo fragrant plant enclosing wall reduces from inside to outside successively, the described bamboo fragrant plant enclosing of internal layer surrounds within the walls and forms hydraulic reclamation district, the first suppression district is formed between two floor described bamboo fragrant plant enclosing wall and the described bamboo fragrant plant enclosing wall of internal layer, the second suppression district is formed between two floor described bamboo fragrant plant enclosing wall and three floor bamboo fragrant plant enclosing walls, mud suppressing layer has been poured in described first suppression district and the second suppression district, the mud apical side height in described hydraulic reclamation district is greater than the first suppression district mud apical side height, described first suppression district mud apical side height is greater than the second suppression district mud apical side height.
Present invention also offers the construction method adopting above-mentioned bamboo raft dowel super large cofferdam to reclaim fields from the sea, comprise the following steps:
A, surveying and locating:
1) understand cofferdam regions along line original soil layer soil property situation, reserves and soil layer top layer and sink silt thickness, in conjunction with the degree of depth of cofferdam mao bamboon stake, determine side's amount of mao bamboon consumption and blowing-filling sludge;
2) survey crew releases two outer edges of mao bamboon according to design cofferdam center line, arranges a control point by every 50 meters, to squeeze in soil as control point and surveys on mao bamboon and establish bamboo cofferdam end face absolute altitude, paint and make mark with mao bamboon;
B, mao bamboon stake plug:
1) mao bamboon pile driving construction adopts the construction method of hand fit's Amphibious type excavator piling, according to mao bamboon design pitch, utilize the control point bracing wire of adjacent cofferdam to control sideline, cofferdam, first artificial mao bamboon is erected come, ensure mao bamboon verticality, then insert inside earth with Amphibious type excavator, under the prerequisite guaranteeing mao bamboon design embedded depth, according to designing, top mark is high intercepts mao bamboon, and it is large head-up, upside down little that mao bamboon plugs requirement;
2) mao bamboon stake is pressed into the original soil layer of having fixed a point, severity control is at 5 ~ 7 meters, mao bamboon is carried out overlap joint colligation with iron wire by top again, lap length should be greater than 4 meters, and overlap will have the length being not less than 2m to insert original soil layer, iron wire colligation spacing should not be greater than every 30cm together, and determine mao bamboon stake upper length according to cofferdam requirement for height, pile crown should exceed hydraulic reclamation mud face more than 1m:
3) when using the mao bamboon stake of overlap joint spreading, the joints of mao bamboon stake can not on the same section in cofferdam, and the joint of adjacent studs staggers at least 1m up and down, so, stake to be joined in advance when the stake of spelling mao bamboon, when transport is deposited, assign stake order pile, hang slotting by the order of regulation during pitching pile;
Setting up of c, mao bamboon framework support body:
1) mao bamboon stake is inserted in soil together with mao bamboon strut, and the Angle ambiguity on mao bamboon strut and ground is between 45 ° ~ 60 °, and the absolute altitude of mao bamboon strut and mao bamboon stake colligation place all should strictly be constructed by design drawing; .
2) in the stake of accomplishing fluently, arrange mao bamboon cross bar with mao bamboon, carry out laterally, longitudinally connecting, adopt the bifilar colligation of 10-12# galvanized wire, horizontal, vertical, oblique mao bamboon intersection all needs colligation; The order of colligation is: first at the position colligation horizontal bamboo bar one in length and breadth of terrain clearance 15 ~ 20cm, spread bamboo basketry sheet as temporary working platform between mao bamboon cross bar simultaneously; Again at the position colligation second mao bamboon cross bar of terrain clearance about 1.5 meters, still between mao bamboon cross bar, repave temporary working platform, complete the 3rd road, the mao bamboon cross bar in the 4th road and the colligation of mao bamboon strut successively by interim bamboo basketry platform and fix;
3) mao bamboon pile spacing is advisable with 1.4 ~ 1.6m, and mao bamboon cross bar and mao bamboon strut should often across layouts;
D, bamboo basketry sheet backstop are arranged:
1) inside cofferdam with iron wire by lashing after the oblique cut grafting of bamboo basketry in mao bamboon stake, lays appropriate to the occasion beginning from the bottom up and arrange, and overlap joint wants tight, can not there is hole, form overall gear mud face;
2) bottom bamboo basketry sheet driving depth 30 ~ 50cm, gear mud face should exceed hydraulic reclamation face more than 80cm, and between bamboo basketry sheet, overlap joint is not less than 10cm, and every sheet bamboo basketry sheet should be no less than 6 ~ 8 colligation points, and bamboo basketry sheet should adopt the fissure of displacement to arrange;
E, woven cloth are laid:
1) according to design height, after back court is first by woven cloth cutting, shipping is to operation area, and on established bamboo basketry sheet backstop face, then overlay one deck woven cloth, woven cloth top is with iron wire colligation on mao bamboon cross bar, and original soil layer is imbedded in lower end;
2) carry out when laying woven cloth will be selected calm, a part of personnel launch above, and and then a part of personnel just carry out colligation and fix, and colligation spacing controls within 30cm, and woven cloth is laid and answered smooth corrugationless, without broken hole;
3) add a row mao bamboon bar outward again in woven cloth, itself and mao bamboon stake colligation woven cloth are fixed with iron wire, mao bamboon distance between tie rods is 2 ~ 3m;
4), when laying, first the extraterrestrial woven cloth by cofferdam height on the scene is made, and be rolled into a bundle, woven cloth lap-joint can adopt package sewer two pass line, and lap length should be greater than 100mm;
F, bamboo basketry cofferdam reinforce:
1) twice and above earth anchor are drawn in the front-seat mao bamboon stake in bamboo basketry cofferdam and mao bamboon cross bar intersection, and the spacing of earth anchor gets 4.0 meters, according to cofferdam height, vertically can establish multiple tracks drawknot rope, namely wire rope;
2) be fixed in mao bamboon stake with wire rope one end of Ф 6mm, the other end is fixed on earth anchor, tension device tense wire rope is used in centre, the angle on wire rope and ground gets 30 °, the mao bamboon of 2 ~ 3m is inserted as earth anchor in soil, this mao bamboon and wire rope oppositely insert the soil body, with the Angle ambiguity on ground at about 45 °;
3) bamboo basketry sheet, woven cloth lay complete after, bottom bamboo basketry sheet and excavate earth in cofferdam with Amphibious type excavator between rear row's mao bamboon strut and mao bamboon stake and carry out backfill presser feet;
Layout buried underground by g, instrument and meter:
Bury the instrument measuring cofferdam resistance to overturning underground, the verticality in Real-Time Monitoring cofferdam, carries out the preventive works of surface settlement and horizontal movement;
H, serous fluid of dredger fill:
1) when hydraulic reclamation height is less than 2m, a hydraulic reclamation can be made; When hydraulic reclamation height is greater than 2m, should adopt layering hydraulic reclamation, each hydraulic reclamation thickness is generally about 0.7 ~ 1m, and lower thickness can be larger, and upper thickness can be less.When hydraulic reclamation scope is larger, need segmentation hydraulic reclamation.Namely after one section of hydraulic reclamation completes, then spreading or mobile pipeline carry out next section of hydraulic reclamation;
2) every layer of hydraulic reclamation complete after interval certain hour, after blowing-filling sludge surface drainage, continue hydraulic reclamation, need assisted drainage if desired;
3) when hydraulic reclamation distance exceedes hydraulic reclamation equipment maximum capacity, the equipment such as force (forcing) pump should be adopted to carry out hydraulic reclamation, ensure the unimpeded of conveying;
I, without the process of sand cushion vacuum method concretion of soft foundation:
Being to realize on mud people's construction by arranging pontoon bridge system on the weak soil of zero bearing capacity without sand cushion vacuum method, setting up the novel evacuated pipeline system that vacuum pump-vacuum tube-plastic draining board directly transmits vacuum pressure.Decrease the slippages of vacuum pressure, improve vacuum pressure reduction dewatering effect, set up vacuum prepressing system under vacuum diaphragm-geotextiles-vacuum tube-plastic woven cloth new membrane, air-locked vacuum diaphragm surrounding is buried in people's soil, itself and atmospheric pressure are completely cut off, utilizes atmospheric effect, bleed with vacuum plant, make it form vacuum, increase effective degree of consolidation of ground.
Construction process is: surveying setting-out → laying woven cloth → plug plastic draining board → laying vertical-horizontal drainage pipe → laying geotextiles → laying vacuum seal film → arrange survey mark → installation vacuum pump → vacuumize preconsolidation soil layer → unloading to detect.
Bamboo raft dowel super large cofferdam provided by the invention has following beneficial effect in the construction of reclaiming fields from the sea:
1, easy construction, the duration is very fast: adopt middle-size and small-size equipment can complete large cofferdam construction in construction, simple to operate, and three row bamboo framework frame structures synchronously can advance enforcement, and progress is fast.
2, construction cost is low: the main material mao bamboon adopted in bamboo raft coffering has the features such as growth cycle is short, instant effect, purposes are wide, and DEVELOPMENT PROSPECT is wide, aboundresources, invests little.
3, construction benefit is high, be conducive to reducing late stage process risk: compared with traditional sandbag cofferdam, sandstone cofferdam, bamboo cofferdam has better drainage performance, employing mud is raw material, reduce the gas leakage risk during vacuum pre-pressed soft soil foundation discharging consolidation in later stage, the construction of envelope wall can be cancelled, decrease construction cost.
4, environmental protection degree of constructing is high, is conducive to reducing environmental costs and drops into: the raw material mao bamboon, geotextiles etc. of constructing used, can not pollute engineering and surrounding enviroment, reduces the input of engineering-environment measure cost.
Accompanying drawing explanation
The present invention has following accompanying drawing:
Fig. 1 for invent the bamboo raft dowel super large cofferdam that provides for after reclaiming fields from the sea schematic top plan view.
Fig. 2 is the A-A sectional drawing of Fig. 1.
Fig. 3 is the structural representation after bamboo basketry sheet in Fig. 1 is arranged at mao bamboon framework.
Detailed description of the invention
Drawings illustrate technical scheme of the present invention and embodiment, further describe each details and the operating principle thereof of embodiment below more by reference to the accompanying drawings.
With reference to Fig. 1, Fig. 2, shown in Fig. 3, bamboo raft dowel super large cofferdam provided by the invention, comprise at least three layers of bamboo fragrant plant enclosing wall 1, the fragrant plant of bamboo described in the present embodiment enclosing wall 1 arranges three layers from inside to outside altogether, each bamboo fragrant plant enclosing wall 1 reduces from inside to outside highly gradually, described bamboo fragrant plant enclosing wall 1 comprises the mao bamboon framework 2 that mao bamboon rod member is built, mao bamboon framework 2 comprises the mao bamboon stake 3 of vertical distribution, the mao bamboon strut 4 of oblique setting and the mao bamboon cross bar 5 of horizontally set, described mao bamboon stake 3, the mutual colligation in position that mao bamboon strut 4 and mao bamboon cross bar 5 intersect is fixed, described mao bamboon stake 3 sets to be goed deep in the soil body, the inner side of described bamboo fragrant plant enclosing wall 1 has set mao bamboon earth anchor 6, mao bamboon earth anchor 6 strains mao bamboon framework 2 by rope 7, many mao bamboon cross bars 5 of differing heights inwardly shorten from bottom to top gradually, most top layer mao bamboon cross bar 5 is laid bamboo basketry sheet and form manway, the medial surface of described mao bamboon framework 2 is perpendicular to distribution on ground, mao bamboon framework 2 medial surface colligation bamboo basketry sheet 7, the medial surface of bamboo basketry sheet 7 is provided with woven cloth 8, the height of the mao bamboon framework 2 of described bamboo fragrant plant enclosing wall 1 reduces from inside to outside successively, surround in the described bamboo fragrant plant enclosing wall 1 of internal layer and form hydraulic reclamation district 9, the first suppression district 10 is formed between two floor described bamboo fragrant plant enclosing wall 1 and the described bamboo fragrant plant enclosing wall 1 of internal layer, the second suppression district 11 is formed between two floor described bamboo fragrant plant enclosing wall 1 and three floor bamboo fragrant plant enclosing walls 1, mud has been poured into as suppression district in described first suppression district 10 and the second suppression district 11, the mud apical side height in described hydraulic reclamation district 9 is greater than the first suppression district 10 mud apical side height, described first suppression district 10 mud apical side height is greater than the second suppression district 11 mud apical side height, the mud apical side height in general described hydraulic reclamation district 9 exceeds the first suppression district 10 mud apical side height 1.5 meters, described first suppression district 10 mud apical side height exceeds the second suppression district 11 mud apical side height 1.5 meters.
With reference to shown in Fig. 1, Fig. 2, Fig. 3, present invention also offers the construction method adopting above-mentioned bamboo raft dowel super large cofferdam to reclaim fields from the sea, comprise the following steps:
A, surveying and locating:
1) understand cofferdam regions along line original soil layer soil property situation, reserves and soil layer top layer and sink silt thickness, in conjunction with the degree of depth of cofferdam mao bamboon stake 3, determine side's amount of mao bamboon consumption and blowing-filling sludge;
2) survey crew releases two outer edges of mao bamboon according to design cofferdam center line, arranges a control point by every 50 meters, to squeeze in soil as control point and surveys on mao bamboon and establish bamboo cofferdam end face absolute altitude, paint and make mark with mao bamboon;
B, mao bamboon stake plug:
1) mao bamboon stake 3 is constructed and is adopted the construction method of hand fit's Amphibious type excavator piling, according to mao bamboon design pitch, utilize the control point bracing wire of adjacent cofferdam to control sideline, cofferdam, first artificial mao bamboon is erected come, ensure mao bamboon verticality, then insert inside earth with Amphibious type excavator, under the prerequisite guaranteeing mao bamboon design embedded depth, according to designing, top mark is high intercepts mao bamboon, and it is large head-up, upside down little that mao bamboon plugs requirement;
2) mao bamboon stake 3 is pressed into the original soil layer of having fixed a point, severity control is at 5 ~ 7 meters, mao bamboon is carried out overlap joint colligation with iron wire by top again, lap length should be greater than 4 meters, and overlap will have the length being not less than 2m to insert original soil layer, iron wire colligation spacing should not be greater than every 30cm together, and determine mao bamboon stake 3 upper length according to cofferdam requirement for height, pile crown should exceed hydraulic reclamation mud face more than 1m:
3) when using the mao bamboon stake 3 of overlap joint spreading, the joints of mao bamboon stake 3 can not on the same section in cofferdam, and the joint of adjacent studs staggers at least 1m up and down, so, stake to be joined in advance when the stake 3 of spelling mao bamboon, when transport is deposited, assign stake order pile, hang slotting by the order of regulation during pitching pile;
Setting up of c, mao bamboon framework support body:
1) mao bamboon stake 3 is inserted in soil together with mao bamboon strut 4, and the Angle ambiguity on mao bamboon strut 4 and ground is between 45 ° ~ 60 °, and mao bamboon strut 4 all should strictly be constructed by design drawing with the absolute altitude of mao bamboon stake 3 colligation place;
2) in the mao bamboon stake 3 of accomplishing fluently, arrange mao bamboon cross bar 5 with mao bamboon, carry out laterally, longitudinally connecting, adopt the bifilar colligation of 10 ~ 12# galvanized wire, horizontal, vertical, oblique mao bamboon intersection all needs colligation; The order of colligation is: first at the position colligation horizontal bamboo bar one in length and breadth of terrain clearance 15 ~ 20cm, spread bamboo basketry sheet as temporary working platform between mao bamboon cross bar simultaneously; Again at the position colligation second mao bamboon cross bar 5 of terrain clearance about 1.5 meters, still between mao bamboon cross bar 5, repave temporary working platform, complete the 3rd road, the mao bamboon cross bar 5 in the 4th road and the colligation of mao bamboon strut 4 successively by interim bamboo basketry platform and fix;
3) mao bamboon stake 3 spacing is advisable with 1.4 ~ 1.6m, and mao bamboon cross bar 5 and mao bamboon strut 4 should often across layouts;
D, bamboo basketry sheet backstop are arranged:
1) after being overlapped by bamboo basketry sheet 7 with iron wire inside cofferdam, lashing is in mao bamboon stake 3, lay appropriate to the occasion beginning from the bottom up and arrange, and overlap joint wants tight, can not there is hole, form overall gear mud face;
2) bottom bamboo basketry sheet 7 driving depth 30 ~ 50cm, gear mud face should exceed hydraulic reclamation face more than 80cm, and between bamboo basketry sheet 7, overlap joint is not less than 10cm, and every sheet bamboo basketry sheet 7 should be no less than 6 ~ 8 colligation points, and bamboo basketry sheet 7 should adopt the fissure of displacement to arrange;
E, woven cloth are laid:
1) according to design height, after woven cloth 8 is first cut by back court, shipping is to operation area, and on established bamboo basketry sheet 7 backstop face, then overlay one deck woven cloth 8, woven cloth 8 top is with iron wire colligation on mao bamboon cross bar 5, and original soil layer is imbedded in lower end;
2) carry out when laying woven cloth 8 will be selected calm, a part of personnel launch above, and and then a part of personnel just carry out colligation and fix, and colligation spacing controls within 30cm, and woven cloth 8 is laid and answered smooth corrugationless, without broken hole;
3) outside woven cloth 8, add a row mao bamboon bar again, itself and mao bamboon stake colligation woven cloth are fixed with iron wire, mao bamboon distance between tie rods is 2 ~ 3m;
4), when laying, first the extraterrestrial woven cloth 8 by cofferdam height on the scene is made, and be rolled into a bundle, woven cloth 8 lap-joint can adopt package sewer two pass line, and lap length should be greater than 100mm;
F, bamboo basketry cofferdam reinforce:
1) draw twice and above mao bamboon earth anchor 6 in the front-seat mao bamboon stake 3 in bamboo basketry cofferdam with mao bamboon cross bar 5 intersection, the spacing of earth anchor gets 4.0 meters, according to cofferdam height, vertically can establish multiple tracks drawknot rope 7, namely wire rope;
2) be fixed in mao bamboon stake with wire rope one end of Ф 6mm, the other end is fixed on earth anchor, tension device tense wire rope is used in centre, the angle on wire rope and ground gets 30 °, the mao bamboon of 2 ~ 3m is inserted as earth anchor in soil, this mao bamboon and wire rope oppositely insert the soil body, with the Angle ambiguity on ground at about 45 °;
3) bamboo basketry sheet 7, woven cloth 8 lay complete after, bottom bamboo basketry sheet 7 and excavate earth in cofferdam with Amphibious type excavator between rear row mao bamboon strut 4 and mao bamboon stake 3 and carry out backfill presser feet;
Layout buried underground by g, instrument and meter:
Bury the instrument measuring cofferdam resistance to overturning underground, the verticality in Real-Time Monitoring cofferdam, carries out the preventive works of surface settlement and horizontal movement;
H, serous fluid of dredger fill:
1) when hydraulic reclamation height is less than 2m, a hydraulic reclamation can be made; When hydraulic reclamation height is greater than 2m, should adopt layering hydraulic reclamation, each hydraulic reclamation thickness is generally about 0.7 ~ 1m, and lower thickness can be larger, and upper thickness can be less.When hydraulic reclamation scope is larger, need segmentation hydraulic reclamation.Namely after one section of hydraulic reclamation completes, then spreading or mobile pipeline carry out next section of hydraulic reclamation;
2) every layer of hydraulic reclamation complete after interval certain hour, after blowing-filling sludge surface drainage, continue hydraulic reclamation, need assisted drainage if desired;
3) when hydraulic reclamation distance exceedes hydraulic reclamation equipment maximum capacity, the equipment such as force (forcing) pump should be adopted to carry out hydraulic reclamation, ensure the unimpeded of conveying;
I, without the process of sand cushion vacuum method concretion of soft foundation:
Being to realize on mud people's construction by arranging pontoon bridge system on the weak soil of zero bearing capacity without sand cushion vacuum method, setting up the novel evacuated pipeline system that vacuum pump-vacuum tube-plastic draining board directly transmits vacuum pressure.Decrease the slippages of vacuum pressure, improve vacuum pressure reduction dewatering effect, set up vacuum prepressing system under vacuum diaphragm-geotextiles-vacuum tube-plastic woven cloth new membrane, air-locked vacuum diaphragm surrounding is buried in people's soil, itself and atmospheric pressure are completely cut off, utilizes atmospheric effect, bleed with vacuum plant, make it form vacuum, increase effective degree of consolidation of ground.
Construction process is: surveying setting-out → laying woven cloth → plug plastic draining board → laying vertical-horizontal drainage pipe → laying geotextiles → laying vacuum seal film → arrange survey mark → installation vacuum pump → vacuumize preconsolidation soil layer → unloading to detect.
Claims (5)
1. a bamboo raft dowel super large cofferdam, it is characterized in that: comprise at least three layers of bamboo fragrant plant enclosing wall, each bamboo fragrant plant enclosing wall reduces from inside to outside highly gradually, described bamboo fragrant plant enclosing wall comprises the mao bamboon framework that mao bamboon rod member is built, mao bamboon framework comprises the mao bamboon stake of vertical distribution, the mao bamboon strut of oblique setting and the mao bamboon cross bar of horizontally set, described mao bamboon stake, the mutual colligation in position of mao bamboon strut and mao bamboon cross-car is fixed, described mao bamboon stake sets to be goed deep in the soil body, the inner side of described bamboo fragrant plant enclosing wall has set mao bamboon earth anchor, mao bamboon earth anchor is by rope stretch mao bamboon framework, many mao bamboon cross bars of differing heights inwardly shorten from bottom to top gradually, most top layer mao bamboon cross bar is laid bamboo basketry sheet and form manway, the medial surface of described mao bamboon framework is perpendicular to distribution on ground, mao bamboon framework medial surface colligation bamboo basketry sheet, the medial surface of bamboo basketry sheet is provided with woven cloth, the height of the mao bamboon framework of described bamboo fragrant plant enclosing wall reduces from inside to outside successively, the described bamboo fragrant plant enclosing of internal layer surrounds within the walls and forms hydraulic reclamation district, the first suppression district is formed between two floor described bamboo fragrant plant enclosing wall and the described bamboo fragrant plant enclosing wall of internal layer, the second suppression district is formed between two floor described bamboo fragrant plant enclosing wall and three floor bamboo fragrant plant enclosing walls, mud suppressing layer has been poured in described first suppression district and the second suppression district, the mud apical side height in described hydraulic reclamation district is greater than the first suppression district mud apical side height, described first suppression district mud apical side height is greater than the second suppression district mud apical side height.
2. bamboo raft dowel super large cofferdam according to claim 1, it is characterized in that: the mud apical side height in described hydraulic reclamation district exceeds the first suppression district mud apical side height 1.5 meters, described first suppression district mud apical side height exceeds the second suppression district mud apical side height 1.5 meters.
3. bamboo raft dowel super large cofferdam according to claim 1 and 2, is characterized in that: described bamboo fragrant plant enclosing wall arranges three layers from inside to outside altogether.
4. adopt the construction method that described in claim 1, reclaim fields from the sea in bamboo raft dowel super large cofferdam, it is characterized in that: comprise the following steps:
A, surveying and locating:
1) understand cofferdam regions along line original soil layer soil property situation, reserves and soil layer top layer and sink silt thickness, in conjunction with the degree of depth of cofferdam mao bamboon stake, determine side's amount of mao bamboon consumption and blowing-filling sludge;
2) survey crew releases two outer edges of mao bamboon according to design cofferdam center line, arranges a control point by every 50 meters, to squeeze in soil as control point and surveys on mao bamboon and establish bamboo cofferdam end face absolute altitude, paint and make mark with mao bamboon;
B, mao bamboon stake plug:
1) mao bamboon pile driving construction adopts the construction method of hand fit's Amphibious type excavator piling, according to mao bamboon design pitch, utilize the control point bracing wire of adjacent cofferdam to control sideline, cofferdam, first artificial mao bamboon is erected come, ensure mao bamboon verticality, then insert inside earth with Amphibious type excavator, under the prerequisite guaranteeing mao bamboon design embedded depth, according to designing, top mark is high intercepts mao bamboon, and it is large head-up, upside down little that mao bamboon plugs requirement;
2) mao bamboon stake is pressed into the original soil layer of having fixed a point, severity control is at 5 ~ 7 meters, mao bamboon is carried out overlap joint colligation with iron wire by top again, lap length should be greater than 4 meters, and overlap will have the length being not less than 2m to insert original soil layer, iron wire colligation spacing should not be greater than every 30cm together, and determine mao bamboon stake upper length according to cofferdam requirement for height, pile crown should exceed hydraulic reclamation mud face more than 1m:
3) when using the mao bamboon stake of overlap joint spreading, the joints of mao bamboon stake can not on the same section in cofferdam, and the joint of adjacent studs staggers at least 1m up and down, so, stake to be joined in advance when the stake of spelling mao bamboon, when transport is deposited, assign stake order pile, hang slotting by the order of regulation during pitching pile;
Setting up of c, mao bamboon framework support body:
1) mao bamboon stake is inserted in soil together with mao bamboon strut, and the Angle ambiguity on mao bamboon strut and ground is between 45 ° ~ 60 °, and the absolute altitude of mao bamboon strut and mao bamboon stake colligation place all should strictly be constructed by design drawing;
2) in the stake of accomplishing fluently, arrange mao bamboon cross bar with mao bamboon, carry out laterally, longitudinally connecting, adopt the bifilar colligation of 10-12# galvanized wire, horizontal, vertical, oblique mao bamboon intersection all needs colligation; The order of colligation is: first at the position colligation horizontal bamboo bar one in length and breadth of terrain clearance 15 ~ 20cm, spread bamboo basketry sheet as temporary working platform between mao bamboon cross bar simultaneously; Again at the position colligation second mao bamboon cross bar of terrain clearance about 1.5 meters, still between mao bamboon cross bar, repave temporary working platform, complete the 3rd road, the mao bamboon cross bar in the 4th road and the colligation of mao bamboon strut successively by interim bamboo basketry platform and fix;
3) mao bamboon pile spacing is advisable with 1.4 ~ 1.6m, and mao bamboon cross bar and mao bamboon strut should often across layouts;
D, bamboo basketry sheet backstop are arranged:
1) inside cofferdam with iron wire by lashing after the oblique cut grafting of bamboo basketry in mao bamboon stake, lays appropriate to the occasion beginning from the bottom up and arrange, and overlap joint wants tight, can not there is hole, form overall gear mud face;
2) bottom bamboo basketry sheet driving depth 30 ~ 50cm, gear mud face should exceed hydraulic reclamation face more than 80cm, and between bamboo basketry sheet, overlap joint is not less than 10cm, and every sheet bamboo basketry sheet should be no less than 6 ~ 8 colligation points, and bamboo basketry sheet should adopt the fissure of displacement to arrange;
E, woven cloth are laid:
1) according to design height, after back court is first by woven cloth cutting, shipping is to operation area, and on established bamboo basketry sheet backstop face, then overlay one deck woven cloth, woven cloth top is with iron wire colligation on mao bamboon cross bar, and original soil layer is imbedded in lower end;
2) carry out when laying woven cloth will be selected calm, a part of personnel launch above, and and then a part of personnel just carry out colligation and fix, and colligation spacing controls within 30cm, and woven cloth is laid and answered smooth corrugationless, without broken hole;
3) add a row mao bamboon bar outward again in woven cloth, itself and mao bamboon stake colligation woven cloth are fixed with iron wire, mao bamboon distance between tie rods is 2 ~ 3m;
4), when laying, first the extraterrestrial woven cloth by cofferdam height on the scene is made, and be rolled into a bundle, woven cloth lap-joint can adopt package sewer two pass line, and lap length should be greater than 100mm;
F, bamboo basketry cofferdam reinforce:
1) twice and above earth anchor are drawn in the front-seat mao bamboon stake in bamboo basketry cofferdam and mao bamboon cross bar intersection, and the spacing of earth anchor gets 4.0 meters, according to cofferdam height, vertically can establish multiple tracks drawknot rope, namely wire rope;
2) be fixed in mao bamboon stake with wire rope one end of Ф 6mm, the other end is fixed on earth anchor, tension device tense wire rope is used in centre, the angle on wire rope and ground gets 30 °, the mao bamboon of 2 ~ 3m is inserted as earth anchor in soil, this mao bamboon and wire rope oppositely insert the soil body, with the Angle ambiguity on ground at about 45 °;
3) bamboo basketry sheet, woven cloth lay complete after, bottom bamboo basketry sheet and excavate earth in cofferdam with Amphibious type excavator between rear row's mao bamboon strut and mao bamboon stake and carry out backfill presser feet;
Layout buried underground by g, instrument and meter:
Bury the instrument measuring cofferdam resistance to overturning underground, the verticality in Real-Time Monitoring cofferdam, carries out the preventive works of surface settlement and horizontal movement;
H, serous fluid of dredger fill:
1) when hydraulic reclamation height is less than 2m, a hydraulic reclamation can be made; When hydraulic reclamation height is greater than 2m, should adopt layering hydraulic reclamation, each hydraulic reclamation thickness is generally about 0.7 ~ 1m, and lower thickness can be larger, and upper thickness can be less.
When hydraulic reclamation scope is larger, need segmentation hydraulic reclamation.
Namely after one section of hydraulic reclamation completes, then spreading or mobile pipeline carry out next section of hydraulic reclamation;
2) every layer of hydraulic reclamation complete after interval certain hour, after blowing-filling sludge surface drainage, continue hydraulic reclamation, need assisted drainage if desired;
3) when hydraulic reclamation distance exceedes hydraulic reclamation equipment maximum capacity, the equipment such as force (forcing) pump should be adopted to carry out hydraulic reclamation, ensure the unimpeded of conveying;
I, without the process of sand cushion vacuum method concretion of soft foundation:
Being to realize on mud people's construction by arranging pontoon bridge system on the weak soil of zero bearing capacity without sand cushion vacuum method, setting up the novel evacuated pipeline system that vacuum pump-vacuum tube-plastic draining board directly transmits vacuum pressure.
Decrease the slippages of vacuum pressure, improve vacuum pressure reduction dewatering effect, set up vacuum prepressing system under vacuum diaphragm-geotextiles-vacuum tube-plastic woven cloth new membrane, air-locked vacuum diaphragm surrounding is buried in people's soil, itself and atmospheric pressure are completely cut off, utilizes atmospheric effect, bleed with vacuum plant, make it form vacuum, increase effective degree of consolidation of ground.
Construction process is: surveying setting-out → laying woven cloth → plug plastic draining board → laying vertical-horizontal drainage pipe → laying geotextiles → laying vacuum seal film → arrange survey mark → installation vacuum pump → vacuumize preconsolidation soil layer → unloading to detect.
5. the employing bamboo raft dowel super large cofferdam according to claim 4 construction method of reclaiming fields from the sea, is characterized in that: described woven cloth adopts bamboo cane to push down fixing, and bamboo cane colligation is on bamboo basketry sheet.
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| CN107190761A (en) * | 2017-07-05 | 2017-09-22 | 中交天航环保工程有限公司 | A kind of artificial bamboo raft cofferdam and its process for constructing |
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